Optical modulation with vanadium oxide thin films

Details Optical modulation with vanadium oxide thin films Optical modulation with vanadium oxide thin films

1979-03-23

1981-08-11

Corbin, John K.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 4, 350353, 356 5, G02B 514, G01C 308

Patent

active

042831130

ABSTRACT:
The specification discloses apparatus for switching light between optical fibers.
A vanadium oxide thin film (28), switchable between high reflectance and high transmission states, is provided for switching a modulated light signal (14) between optical fibers. An input optical fiber (10) carries the modulated signal which is incident on the surface film (28). The signal is transmitted through the film in its transmitting state into a first output optical fiber (20) disposed behind the film. When the film is switched to its reflecting state the signal is reflected into a second output fiber (18) disposed at an appropriate angle to the film. A series of thermoelectric junctions (30) are positioned in thermal contact with the film for selectively heating and cooling the film above or below its transition temperature to switch the film between its transmission and reflecting states. A control device (32) selectively switches current to or from the junctions for switching the film between states.

REFERENCES:
patent: 3484722 (1969-12-01), Barker, Jr. et al.
patent: 3497286 (1970-02-01), Morton et al.
patent: 3509348 (1970-04-01), Boyle et al.
patent: 3664726 (1972-05-01), Mattis
patent: 3789420 (1974-01-01), Claytor et al.
patent: 3831165 (1974-08-01), Chivian et al.
patent: 3870396 (1975-03-01), Racki et al.
patent: 3874779 (1975-04-01), Thiel
patent: 3977764 (1976-08-01), d'Auria et al.
patent: 3993400 (1976-11-01), Leib
patent: 4068952 (1978-01-01), Erbert et al.
Weiser et al., "Optically Erasing a Thermally Biased Thermally Switchable Film", IBM Tech. Disc. Bull., vol. 16, No. 7, Dec. 1973, pp. 2075-2076.

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